def __init__(self, resource_name=None, **keyw):
"""ResourceTemplate class constructor. It opens a session to the
resource.
Parameters:
resource_name -- (optional) the VISA name for the resource,
e.g. "GPIB::10". If "None", it's assumed that the resource manager
is to be constructed.
keyw -- keyword argument for the class constructor of the device instance
to be generated. Allowed arguments: lock, timeout. See Instrument
class for a detailed description.
"""
_warn_for_invalid_keyword_arguments(keyw, ("lock", "timeout"))
if self.__class__ is ResourceTemplate:
raise TypeError("trying to instantiate an abstract class")
if resource_name is not None: # is none for the resource manager
warnings.filterwarnings("ignore", "VI_SUCCESS_DEV_NPRESENT")
self.vi = vpp43.open(resource_manager.session, resource_name,
keyw.get("lock", VI_NO_LOCK))
if vpp43.get_status() == VI_SUCCESS_DEV_NPRESENT:
# okay, the device was not ready when we opened the session.
# Now it gets five seconds more to become ready. Every 0.1
# seconds we probe it with viClear.
passed_time = 0 # in seconds
while passed_time < 5.0:
time.sleep(0.1)
passed_time += 0.1
try:
vpp43.clear(self.vi)
except VisaIOError as error:
if error.error_code == VI_ERROR_NLISTENERS:
continue
else:
raise
break
else:
# Very last chance, this time without exception handling
time.sleep(0.1)
passed_time += 0.1
vpp43.clear(self.vi)
_removefilter("ignore", "VI_SUCCESS_DEV_NPRESENT")
timeout = keyw.get("timeout", 5)
if timeout is None:
vpp43.set_attribute(self.vi, VI_ATTR_TMO_VALUE,
VI_TMO_INFINITE)
else:
self.timeout = timeout
def __init__(self, resource_name=None, **keyw):
"""ResourceTemplate class constructor. It opens a session to the
resource.
Parameters:
resource_name -- (optional) the VISA name for the resource,
e.g. "GPIB::10". If "None", it's assumed that the resource manager
is to be constructed.
keyw -- keyword argument for the class constructor of the device instance
to be generated. Allowed arguments: lock, timeout. See Instrument
class for a detailed description.
"""
_warn_for_invalid_keyword_arguments(keyw, ("lock", "timeout"))
if self.__class__ is ResourceTemplate:
raise TypeError, "trying to instantiate an abstract class"
if resource_name is not None: # is none for the resource manager
warnings.filterwarnings("ignore", "VI_SUCCESS_DEV_NPRESENT")
self.vi = vpp43.open(resource_manager.session, resource_name,
keyw.get("lock", VI_NO_LOCK))
if vpp43.get_status() == VI_SUCCESS_DEV_NPRESENT:
# okay, the device was not ready when we opened the session.
# Now it gets five seconds more to become ready. Every 0.1
# seconds we probe it with viClear.
passed_time = 0 # in seconds
while passed_time < 5.0:
time.sleep(0.1)
passed_time += 0.1
try:
vpp43.clear(self.vi)
except VisaIOError, error:
if error.error_code == VI_ERROR_NLISTENERS:
continue
else: raise
break
else:
# Very last chance, this time without exception handling
time.sleep(0.1)
passed_time += 0.1
vpp43.clear(self.vi)
_removefilter("ignore", "VI_SUCCESS_DEV_NPRESENT")
timeout = keyw.get("timeout", 5)
if timeout is None:
vpp43.set_attribute(self.vi, VI_ATTR_TMO_VALUE,
VI_TMO_INFINITE)
else:
self.timeout = timeout
def __init__(self, resource_name=None, **keyw):
_warn_for_invalid_keyword_arguments(keyw, ("lock", "timeout"))
if self.__class__ is ResourceTemplate:
raise TypeError("trying to instantiate an abstract class")
if resource_name is None: # is none for the resource manager
return
warnings.filterwarnings("ignore", "VI_SUCCESS_DEV_NPRESENT")
self.vi = vpp43.open(resource_manager.session, resource_name,
keyw.get("lock", VI_NO_LOCK))
if vpp43.get_status() == VI_SUCCESS_DEV_NPRESENT:
# okay, the device was not ready when we opened the session.
# Now it gets five seconds more to become ready. Every 0.1
# seconds we probe it with viClear.
passed_time = 0 # in seconds
while passed_time < 5.0:
time.sleep(0.1)
passed_time += 0.1
try:
vpp43.clear(self.vi)
except VisaIOError as error:
if error.error_code != VI_ERROR_NLISTENERS:
raise
break
else:
# Very last chance, this time without exception handling
time.sleep(0.1)
passed_time += 0.1
vpp43.clear(self.vi)
_removefilter("ignore", "VI_SUCCESS_DEV_NPRESENT")
timeout = keyw.get("timeout", 5)
if timeout is None:
vpp43.set_attribute(self.vi, VI_ATTR_TMO_VALUE, VI_TMO_INFINITE)
else:
self.timeout = timeout